Ninth International Workshop on Languages for Modelling Variability (MODEVAR@SPLC 2025).

More than 30 years ago, feature models were invented. Nowadays, they play a major role in Software Product Line Engineering. Several attempts have been made to establish a standard approach (e.g., OVM, CVL, TVL, etc.), yet researchers are still searching for a simple feature modelling language. To address this challenge, a community-driven variability language called Universal Variability Language (UVL) has been proposed to improve information sharing among researchers and tool developers. Following the spirit of the previous eight editions, this workshop is an interactive event where all participants share knowledge, ongoing realizations, and improvements concerning the UVL to increase its outreach further.